I read the help docs you have on your site, and found them very helpful. The thing I don't get, is when you send an SMS with another cellphone, you don't have to specify a carrier. How does this work? How would you do this with a computer?

However, I have managed to lead you a little off topic. You have two options with PageGate. The way it is typically used is to setup recipient and carrier information ahead of time. You do need the carrier information for this to work (i.e. protocol, phone-number/host, communication settings, etc.) The other option that could take advantage of what you describe to work would be to hook a mobile phone or wireless modem directly to the serial port of the computer running PageGate. If the phone/modem supports the GSM 7.07 commandset, then PageGate can send messages completely wirelessly though your mobile phone or wireless modem. Since this sends the messages the same way you would from entering on the phone itself, it should be able to deliver messages in the same way.